Synthesis, Consolidation and Significant Enhancement in Thermoelectric Properties of Ca3Co4O9 Bulk Ceramics by Adding Silver Combine Spark Plasma Texturing | Chapter 6 | Current Innovations in Chemical and Materials Sciences Vol. 1

 The objective concerning this work is the significant augmentation of the thermoelectric properties of Ca3Co4O9 size ceramic by an creative process ‘Spark plasma Texturing’ (SPT) capable to integred into thermoelectric device. The work existed in synthesizing Ca3Co4O9 compound by substituting Ca2+ cations accompanying Ag+ cations, or by adding large silver in the Ca3Co4O9 step in order to impose upon the metallic type of silver and the effect of composition to optimize the power determinant (PF) and the figure of merit (ZT). The thermoelectric performance (for either capacity generation or chilling) depends on the efficiency of the thermoelectric material for transfering heat into electricity. The adeptness of a thermoelectric material depends primarily on the thermoelectric matters figure-of-merit, known as zT (0). The XRD dossier have shown that bigger phase is the Ca3Co4O9 individual, accompanied by silvery Ag phase, that shows that Ca3Co4O9//Ag compound is composite.  Both the traditional habit of synthesizing response in the solid state and the contemporary texturing approach famous as Spark Plasma Texturing (SPT), which connects the directed type of Hot Pressing (HP) and the Spark Plasma Sintering (SPS) method, were handled. Grain sizes and preferred introduction perpendicular to the important axis are told by microstructural examination of sintered pellets created by SPT. These grains are considerably bigger in magnitude than those produced by SPS. Consequently, the study acquired a maximum PF value 555μW.m-1 K-2  at 900 K, that is among high-quality reported about constitute materials and a period saving of 98% distinguished to Hot Pressing (HP).

Author(s) Details:

Jerome Dikwa,
College of Technology, The University of Ngaoundere, P.O. Box 455, Ngaoundere, Cameroon and Faculty of Science, The University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon.

Jean-Marie Bienvenu Ndjaka,
Faculty of Science, The University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon.

Danwe Raidandi,
National Advanced School of Engineering, The University of Yaounde 1, P.O. Box 8390, Yaounde, Cameroon.

Simon Quetel-Weben,
CRISMAT-ENSICAEN Laboratory, UMR CNRS 6508, 14050 CeanCedex, France.

Pierre Owono Ateba,
Faculty of Science, The University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon.

Please see the link here: https://stm.bookpi.org/CICMS-V1/article/view/11875